Pulsator for milking machines



Feb. 9, 1932. F. a. HODSDON PULSATOR FOR MILKING MACHINES 6 Sheets-Sheet 1 Filed June 21, 1930 Feb. 9, 1932. F. G. HODSDON PULSATOR FOR MILKING MACHINES 6 Sheets-Sheet 2 Filed June 21, 1930 7 Y .v. fl 2 Feb. 9, 1932. F. a. HODSDON PULSATOR FOR MIL-KING MACHINES Filed June 21. 1930 6 Sheets-Sheet 3 a w l A-.. 7

Feb. 9, 1932. F. a. HODSDON PULSATOR FOR MILKING MACHINES Filed June 21, 1930 6 Sheets-Sheet 4 Feb. 9, 1932. F. G. HODSDON 1,844,853

BULSATOR FOR MILKING MACHINES Filed June 21, 1930 6 Shets-Sheet 5 W unluwmuw m I Feb 9, 1932" I G HQDSDQN 1,844,853

PULSATOR FOR MILKING MACHINES Filed June 21, 1930 6 Sheets-Sheet 6 I, I 1&2672207 lr7 Patented Feb. Q, 1932 r N T D STATES PATENT OFFICE FLOYD G. HODSDOH, 01 LA GRLHGE, ILLINOIS, ASSIGNOB TO TNTEBNATIONAL HAB- vmm will A OOH-PORTION 01' m romroa ma e n Application mu June 21,1930. Serial lie. was.

This invention relates-to an improved pulsator for use primarily in milking machines of the type employin of teat cups of t e dou le-chambered variety a of conventional commercial form The energy utilized to operate the liners" in the teat cups is supplied b a vacuum pump in com.- munication with t e ulsator and a milk receiver pail, the functlon ofithe pulsatorbeing, as is well known in this'art, to produce the alternate vacuum and release to atmosphere to effect the milking action, there be'-.

iug connections from the teat cups to lead the mill: to the receiver Most pulsators as now own use leather pistons reciprocable in a cylinder. These pistons require oilin to keep them air tight. It has been found t at this oil catches and accumulates dust particles, which eventually v clog and seal associated ports and passageways in a manner to interfere with, if not entirely to prevent, operation of the pulsator. Change in temperature also afiects the o ration of oiled istons because of variable riction between i parts resulting from viscosity change in the oil. Thus, the use of oil in pulsators is hi hly objectionable Furthermore, the leat er piston is a source of p, trouble in the event that water or moisture should accidentally contact therewith, because it results in hardening of the leathers, causing air leakage, These piston types usu ally employ a spring tripping device, necessitating the useoi small bearings which wear a V I W and cause slugglshness in the pulsator action,

and complicate manufacture and involve reiatively high costs.

With these objections noted, the problem is to rovide a pulsator having. none of these disa vantages. 4

Accor ly, the primary objects of this invention are to provide an improved pulsator having a minimum number, of movable A parts, in fact, just two 3 to provide a pulsator which at no time requires oiling; to provide one or two clusters a pulsator of symmetrical appearance and which is capable of production at a minimum of cost;-to provide a pulsator capable of assembly and tearing down withoutithe aid of special tools, in fact, an; ordinary screw driver being all that i'snecessary for the purpose; to provide apulsator producing strong and definite ulsations; to provide an adjustable spec regulating means for a control valve without 'in any way keeping the pulsator valve from producinfig stron -pul sations; to associate an air ter wit the pulsator' and, lastly, nerally to provide an improve pulsator for he purpose stated.

riefly, such impor ant ob ects may be achieved by the illustrative example of the invention shown in the accompanying sheets of drawings, in which the pulsator has a 1101- low, cube-shaped body carr nga diaphragm to form a diaphragm chamber on each of its four sides. Two opposed diaphragms have connected thereto an upper reciprccatory slide valve called the control valve, while the two remaining opposed diaphrag'ms have connected thereto a lower reciprocatory slide valve called the milker valve. Cooperative ports and grooves are provided in these slide valve members, so that, when associated with certain valve plates, the control valve regulates the action of the milker valve to result in the pulsations as required,

both slide valves being always subjected to full action of air and vacuum, there being a speed regulator associated with the up er or control valve and likewise a filter, so t. at only clean air may pass by the regulating needle valve oint.

So much will suflice for the present in giving a general idea of the puls'ator structure, a practicable form of which is illustrated in the accompanying sheets of drawings, where Figure 1 is a vertical, cross sectional view of ther-pulsator when loo in the direction of the-arrows, as seen inigurefi;

between; I

tion formed as a part of the body; Figure 5 is a side view of the base shown in Figure4; Figure 6 1s a side sectional view, showing the lower, or milker, valve and the upper stationarly valve plate associated therewith as seen a ong the section line 6-6 shown in Fi ure 12;

Figure 7 is a top plan view showing the upper control valve, the lower milker valve, and the upper stationary valve plate there- Figure 8 is a rspeetive view of the structure shown in igure 7 on an enlarged scale, with a section therethrough along an irregular line to expose certain ports and grooves;

Figure 9 is a similar sectional view of the same parts taken along an irregular. section line to expose to view certain other ports and grooves;

Figure 10 is aview similar to Figure 7, but showing the parts in different relative posltions;

Figure 11 is a perspective cross sectional view along a staggered section line through the structure shown in Figure 10 to show another cooperative, relative relationship of the various ports and passage-ways;

Figures 12 and 13 are plan views showing different relative er slide valve wit respect to the upper stationary valve plate;

Figure 14 is a lon 'tudinal cross sectional view through the s owing of the parts in Figure 7 when viewed along the section line 1414, with the lower slide valve left out to show a relative position which the upper slide control valve assumes with respect to the 111)- per stationary valve plate;

Figure 15 is a top lan detail view of the upper control slide va ve;

Figure 16 is a bottom plan view of the same piece shown in Figure 15;

Figure 17 is a side View of the same piece;

Figure 18 is a longitudinal cross sectional view of the same piece as shownalong the line 1818 in Figure15, when looking in the direction of the arrows; v

Figure 19 is a longitudinal sectional view through the same piece as seen along the line 19-19 appearing in Figure 15, when looking in the direction of the arrows;

Figure 20 is a cross sectional view through the samepiece as viewed along the line 20-20, when looking in the direction of the arrows, as appears in Figure 15;

F 1 re 21 is a top plan view of the lower or milker slide valve;

ositions of the lower milk- P view of said milker control valve, as seen alo the lines 22-22 appear' in Fi 21 whiz? looking in the directs 'ori o f the a r rb ws;

Fi re 23 is a similar longitudinal sectiona view of the same piece when viewed along the line 2323 looking in the direction of the arrows, as seen in I" re 21;

Figure 24 is a cross sectional view of the same piece as seen along the section line 24-24 ap in F i re 21, when lookin in the direction of e arrows;

- igure 25 is a detail, top plan view of a gasket used in the pulsator;

Figure 26 is a top plan view of the upper stationary valve plate; and,

Figure 27 is a top plan view of the lower stationary valve plate.

As best shown in Figures 1 to 3, inclusive,

the pulsator body '30 comprises an integrally formed frame in hollow cube form having four sides and a top, each formed with a pearin at 31 and the top opening at 32, t e atter. ing closed by a quickly detachable cover plate 33 to make 'ble ready access to and inspection of the interior parts. Each side opening is closed by a circular diaphragm 34 preferably made of a rubberized fabric, the diaphragms thus being disposed in oposed airs, as best appears in Figure 2.

hese iaphra s are secured over the circular openln y means of outwardly bulged caps 35 attac ed by screws to the body frame. Thus, oppositely arranged diaphragm chambers 36 are formed for a purpose later to, ap-

ar. The lower part of the body includes an integrally formed frame cross 37 (see Figure 3), which merges into a centrally disposed part 38, which rises vertically to afiord a flat rest or base 39, as shown in Figures 1 and 5. The part 38 is vertically hollowed out, as at 40, to form a taper socket to fit over a ta er plug on a cover of amilk receiver pai A pin 41 serves to make a quickly detachable lock whereby the pulsator may be secured to or quickl removed from the pail. This pin is part 0 aconventional bayonet slot arrangement and need not further be described. The art 38 includes two chambers 42 and two iametrically aligned bars of the cross 37 are drilled andtapped to receive threaded nipples 43, one each of which communicates with a chamber 42, while a third bar of the cross is drilled and tapped with a relatively large bore to receive a relativel larger nip 1e 44, that communicates not with the chain rs B, but with the interior of the taper socket 40, as best appears from Fig-Q l stood in this art. The n1 les 43 are air it is to be understood that one of the nipples 43 will be unscrewed and a screw plug W111 besubstituted therefor in a manner to stop up one of the air bores in the cross 37. The fourth bar of the cross not yetmentioned is left solid and serves merel as a frame piece.

. The valve structure, whic makes and regu lat'es the pulsationsacting in the teat'cups to produce the milking action, will now be described.

The base 39 in effect forms a square horizontal table, each corner carryin a. vertically.extending post 45, each of a di erent cross sectional area, but of uniform height. Loosely fitted over these posts is a square shaped lower, stationary valve plate 46, shown in detail in Figure 27, said late having four corner holes, each of a di erent size to correspond to the size of the posts 45, whereby the plate can belocated onl in one way to make its assembly fool roo This plate 46 is preferably made -o hardened stainless steel havin surfaces und and polished to mirror-l1 e finish. he posts 45 prevent this valve plate from having any lateral movement whatsoever, yet it is free to float up and down on the posts 45 slightly, as oocasion j requires. This stationary plate 46 has a central hole 47 connecting with the vacuum supply through the taper socket. 40, while side slots 48 in the plate communicate with the air chambers 42 and air nipples 43. See Figure 1.

Next in the assembly is the lower or milker slide valve 49, shown in detail in Figures 21 to 24, inclusive, which valve is disposed horizontally on the lower stationary valve plate 46 between the posts 45 which now serve as guides, said slide valve 49 being disposed to reciprocate as shown in the drawings only in an east (E) and west (W) direction. This lower or miilrer slide valve is preferably made of brass or other relativel soft material, so that the friction between t 9 top surface of the plate 46 and the bottom surface of the slide valve 49 is reduced to a minimum, and, as a result, these cooperating surfaces may be run dry and no oil is required.

The E end of the slide valve is secured by means of a screw and washer 50 to the E diaphragm 34, while the W end of said valve is similarly secured by the same kind of means 50 to the W diaphragm 34, as best appears from Figure 2. The slide valve 49 is I 51, an

rectangular in shape (Figures 21-24, inclusive) and at the intersection of its center lines is rovided with a short, lengthwise slot valve slides upper surface is formed with two grooves 52, 53 in commun1cat1on,respecin cross alignment therewithv the tivel with bores 54, 55 extending through the s ide along its sidesin opposite directions formed in t e slide to one side of the slides. longitudinal center line and extends a substantial distance to the E, while an oppositely disposed, similar groove 57 extends toward the W, the inner/ends of each of these grooves being cut square, as shown. At its ends, the

slide 49 is provided with relatively large openings 58.

In Figure 26 is shown the upper, stationary valve plate 59, which comes next in the assembly, said plate 'bein like the lower plate 46 in that itis hard, po ished, and has four corner holes to fit over the posts 45 in the manner already described, so that it can be assembled in only one way. The posts here too hold the plate 59 against lateral movement, but permit said plate to float, if necessary. A Placed therein in the desired manner, this upper, stationary valve 7 plate is provided with nine holes 60, 61, 62, 63, 64, 65, 66, 67 and 68.

The control slide valve is shown generally at 69 in Figures 15 to 20, inclusive, said valve being rectangular and lying between the posts45 on the upper valve plate 59 for reciprocation as illustrated in the drawings in a north control valve is also made of brass or the like,'so it will have little or no friction when sliding over the top surface of the plate 59, and consequently no oil is required. The under surface of the control slide, as appears best in Fi ure 16, is formed with a short, centrally d1sposed, lengthwise groove 70, the ends of which are continued in opposite directions to form connecting, odset grooves 71, 72. A pin hole 73 is located centrally through the cove and slide plate. This slide on its ottom has also two diametrically opposed side grooves 74, 7 5 which, respectively, communicate with .iGOlGS 76, 77 through the slide, speetively, counicate with the N and S diaphragm chambers 36, as best shown in. Figure 2, said control slide in the same manner as the milker slide 49 having its respec- (N) and south (S) direction. This which bores further, re-.

iie

tive ends connected to the N and S diacommunicates with through-holes 86 and 81,

respectively. At its ends the slide is formed with large openings 82. The top surface of this control slide is formedwith an enlarged circular rest 83 and a small circular groove 84, which is in communication with the holes- 80, 81 heretofore mentioned (see Figure 15).

Rising centrally from the center of the groove 84, the rest is formed with an into-- gral, cylindrical post 85 formed with four side grooves 86 and an axial, threaded hole 87 in alignment with the pin hole 73 heretofore mentioned. See Figures 15, 17 and 20. A cross bore 88 is formed diametrically through the base of the cylindrical post 85 in a manner to communicate with the grooves 86 and central bore 87.

The circular rest 83 of the control slide valve carries, as shown in Figure 1, an annu lar filter pack 89 of fibrous material. Between the filter 89 and rest 83 is disposed a cork gasket 90 (see Figure 25) having a central opening to fit over the stem 85 and a plurality of radial slots 91 in communication with the annular groove 84. These slots cause air to move radially out and then upwardly through the filter pack. A central, vertical sleeve 92 separates the filter ack from the grooves 86 in the stem 85, the s eeve resting on the washer 90. A wire mesh screen 93 is placed on the sleeve 92 above the pack. 89, so that the cleaned air can find itsway to the stem grooves 86 and into the stem bore 87.. A cover 94 completes the filter assembly, which cover rests on the rest 83 and is held down by an adjusting screw 95 that includes a needle valve 96 cooperable with the pin hole 73 in the control slide valve 69, in the manner shown in Figure 1. A thumb nut 97 serves to hold the cover 94 down irrespective of the osition of the adjusting screw 95 in an vious manner. This concludes the description of the structural parts ofvthe pulsator. The specification will now be continued by setting forth the mode of operation.

A taper plug provided on the milk receiver pail cover receives the socket 40 of the pulsator in a conventional manner. Vacuum is applied to the ail through the large mpple 44 in the pu sator, which is connected to a pipe line stall cock by a stanchion hose.

A needle valve. 96 on the upper slide valve 69, called the control valve, regulates its speed by controlling the admision of air, so that, no matter how slowly the valve moves, it will nevertheless cause a ra id movement of the lower or milker slide V vs 49, which remains at the end of its stroke until the control valve slowly approaches the other end of its stroke. Such a snappy, strong pulsation is the most agreeable to the cow an so milks the cow rapidly and leaves but little for hand stripping.

Four diaphragms are mounted one on each end of the two slide valves. diaphragm is so clam ed under a cover: as to allow the slide va ves which are fastened to the center of the diaphragms to move freel from /16 inch to 3/8 inch in a horizontal irection. As vacuum is applied by a assa e-way leading to the face of each side v ve, which connects througha hole to the chamber in back of each diaphragm, movement is provided in the direction to which the vacuum is a ilplied. At the same time, the diafihraim c amber space at the e(:pposite an of t e slide valve must be open to the atmosphere to relieve the vacuum that had previously been supplied to it.

As shown in Figure 1, for example, the milker slide valve 49 with its lower side has moved to the west position, so that vacuum has been applied to the left hand nipple 43 which connects through a rubber hose to the milker claw, not shown. The lower art of this claw, in the usual way, collects t e milk from the four teat cups connected to the claw and leads it throu h a milk hose to the milk receiver pail, said pail and milk line being under continuous vacuum. Around the upper part of these claws in the usual way are four additional nipples which lead to the space between the teat cup rubber liner and metal teat cup shell. A rubber air hose makes the connection between this claw and the ulsator, the said hose being connected to t e pulsator air nipple 44. Thus, with the mil er slide valve in its west position, vacuum is applied to this liner space, which holds it in a normal position, because there is, at this time, a vacuum on both sides of the rubber liner. Milk now flows from the cows teat until this milker ulsator valve 'moves to the east position. Khan the east port is uncovered and air rushes in to destroy the vacuum, and so allows the rubber liner to collapsestrongly upon the cows teat, shutting off the milk and so massaging the teat in a manner to keep n blood circulation. At the next movement 0 themilker valve, the vacuum is. applied again to the liner, which once more returns to normal to cause milk to flow again and so the action alternately continues at from to pulsations per minute.

Generally, ooves or slots, on the upper side of the m' er slide valve and on the lowor side of the control valve, move across the tholes in the upper valve late and so overn the relative movement 0 the slide va ves in the particular manner now to be set forth.

1 On the upper side of the control slide valve is mounted a cup 94 held down by a lock nut 97 on the regulating valve screw 95. The hole 64 in the u per stationary valve plate 59, which, lies oosely on top of the milker slide valve 49 is always connected with the center port 51 in the milker slide 49, which port 51 is a slot that is open clear through so that it is in continuous connection with the vacuum supply independently of the relative positions assumed in the operation of the pulsator by either slide valve. On the under side of the control slide valve 69 is a port 70, which is also at all times in connection with the hole 64 which covers port 51 in the milker slide valve. Thus, it can be seen that port with its curved ends till . slightly,

7'1 and 7 2 is constantly connected to the vacuum line. Byturning to the sectional view of Figure 1, it will be seen that the needle valve 96 is operable in this same port 70. Ports 7 9 and 78 have holes 81 and 80 in one end drilled through the control slidevalve,

to connect it with the annular groove 84 on At the top of the filter, screen wire 93 allows theair to pass between the filter cup top 92, thence downwardly and the spacer sleeve the stem 85, and so by to the cross bore 88 in the needle valve to the port 7 O.

In operation, the valve port 70 moves north, as appears in Figure 11, across the upper valve plate 59, so that this port connects holes 64 and 60 as in Figure 14 in registry at the end or the stroke, while the hole 68 is uncovered and exposed to the air,

which air comes up from the openings around the cross 37 at the bottom of the pulsator. On the milker slide valve 49, the port 52 is only connected with the hole 60, since at this moment the inilker slide valve is at the west position and the control slide valve is moving north. lhe square end port 70 slowly opens the vacuum to hole 60 connected to the port 52. Then the lower slide valve moves to the east but, as it does so, port 52 slides under a hole-61 which has already been opened to port 70 through its curved end 71, as shown in Figure 10. This gives it added impetus and so holds it over even after the upper slide valve may have started south. With port 52 exposed to vacuum and port 53 exposed to air, since holes 68 and 67 in the plate 59 are uncovered, the milker slide valve 46 moves to the eastuntil it is stopped by shoulders 98 on the upper surface; striking t e upper valve plate 59.

The next movement is or the control valve 69 movingslowly towards the south, because the port 56 in the milker slide valve has its east end uncovered to air, since it is extended out to the east from underneath upper valve plate 59, as is clearly shown in Figures 7, 8, 9 and 13. Hole 63 in plate 59is thus exposed to air and it in turn connects continuously with groove 74 in the upper control valve 69, which groove 74 leads through the passage-way 76 to the north diaphragm chamber, thereby breaking the vacuum at that end. At the same instance the control valve 69 is connected to vacuum through the drilled hole or passageway 77, which communicates with groove 75; thence to hole 65 in the plate 59, which in turn is connected to hole 66 in the plate by a groove '57 in the lower or milker slide valve 49. Then,

south diaphragm of the since hole 66 and hole 62 oiplate 59 are at all times in continuous communication with the corresponding grooves 79 and 7 8 in the control slide 69, the movement of said control slide valve is slowly south, since, as was described previously, the vacuum is regulated by t e setting of the regulating screw 96.

Groove 52 in the milker slide valve connects throughthe drilled passage 54 to the east diaphragm chamber, and slot 53 through passage connects to the west diaphragm chamber. These are, at all positions of the milker slide valve, in communication with the correspondin holes and 68 in the upper valve plate 59. u like manner, grooves 75 and 74 in the control valve are connected through passage-ways 76 and 77 to the corresponding north and south diaphragm chambers.

Also these ports are in continuous communication at all positions of the control valve 69 with the holes and 63 in the upper valve plate 59. In the same way, grooves 7 9 and 7 8 are always in continuous communication with holes 62 and 66.

It will be noticed in Figures 16 and 21 that both ends of the grooves and one inner end of each of the grooves 56 and 57 are finished square. As the square ends of these grooves approach and move across their corresponding holes in the upper valve plate, they present the largest possible opening with the least movement and are important in that they make the beginning of each of the four strokes. The length and position of these grooves are so arranged that air is allowed to enter and release one diaphragm slightly in advance of opening to yacuum the,

shown, the control and milker slide valves rnove along intersecting axes in horizontal planes.

The upper and lower stationary valve plates are made oi" very hard material and are polished smooth, so that there is no leakage from one port to another. The slide valves themselves are of brass or die casting material. Such surfaces slide over each other when dry, with but little iriction.

Vacuum tends to pull these valves together and, the longer these faces slide on each other, the closer they will fit together. l lo oil whatever is required on this pulsator, so there is nothing to collect dust out of the atmosphere. The air filter removes all dust that might tend u plied to the energy required filtering it out before it reaches this position.

'Ihus the pulsator, having such large diaphragms is very powerful and pulsate on a minimum of only two inches-of vacuum;

.or on a fifteen inch vacuum, there is available a force of twenty pounds to move the slide valves. Such a large force is not at allnecessary, except that, the greater the energ' supthe more accurate will the pulsator speed be maintained.

From a manufacturing standpoint, this pulsator should be cheap to build. There are no springs or small bearings. No small drilled holes are required in the lar main body casting. All ports are put in e slide valves where they are easily accessible. ()nly two moving parts are involved and, as they are both inside of the body they are thor- I oughly protected. A screw driver is all that is needed to take the pulsator completely apart and to put it together v The example herein obviousl represents only one practicable form whic the invention may assume. Therefore, it is the intention herein to cover all such variations and modifications thereof which do not materially depart from the spirit and scope of the invention as is indicated by the definitions thereof comprising the appended claims.

What is claimed is: 1. .In a machine pulsator, a body including a connection to a source of vacuum and a connection to air, a milker valve, a control valve, said valves being supported in the body for relative movement in horizontalv planes of each other and formed cooperating ports, and means for regulatmg porting to vacuum and air whereby the contro valve moves a full stroke while the milker valveis idle and then causes the milker valve to make a quick stroke to transmit pulsations to the teat cups of a milking machine. 2. In a milking machine pulsator, a body including a connection to a source of vacuum and a connection to air, a milker slide valve, a control slide valve, said valves havin cooperating ports and movable relatively to each other on intersecting axes, and means for regulating porting to vacuum and air whereby the controlslide valve moves a full stroke while the milker valve is idle and then causes the milker slide valve to make a quick stroke to transmit pulsations to the teat cups of a milking machine.

3. In a milking machine pulsator, a body including a continuous connection to a source of vacuum and a connection to air, a milker slide valve, a control slide valve, said valves having cooperating ports and being slidable c of each other, and means for re lating porting to vacuum and air wherefii y the control slide valve moves a full stroke while the milker slide valve is idle and then unease stantially a full stroke while the milker valve is idle and then causes the milker slide valve to make a quick stroke to transmit pulsations to the teat cups of a milking machine;

5. In a milking machine pulsator, a body including a continuous connection to a source of vacuum and a connection to air, a reciprocatory milker slide valve, a reciprocatory control slide valve, said valves 1 g in horizontal planes and being supporte i ii the body and having cooperating rts, and stationar horizontally dispose valve means san wiched between the slide valves for regulating portin to vacuum and air whereby the control sli e valve moves to cause the milker slide valve to make a'quick stroke to transmit pulsations to the teat cups of a milking machine.

6. In a milking machine pulsator, a body including a connection to a source of vacuum and a connection to air, ;a milker valve, a control valve, a valve member, said valve parts all lying in horizontal planes one above the other and being supported in the bod and provided with ports connectible with air and vacuum and cooperable in a manner to produce relative movement of the milker and control valves whereby pulsations are transmitted to teat cups of a milking machine.

7. In a milking machine pulsator, a bodv including a connection to a source of vacuum and a connection to air, a milker valve, a control valve, a valve member between the milker and control valves, said valve puts all lying in horizontal planes andbeing supported 1n the body and provided with ports connectible with air and vacuum and cooperable in a manner to produce relative movement of the milker and control valves whereby pulsations are transmitted to test cups of a milking machine.

8. In a milking machine pulsator, a body including a connection to a source of vacuum and a connection to air, a milker slide valve, a control slide valve, a stationary valve member between the two slide valves, said valve parts all lying in horizontal planes and being supported in the body and provided with ports connectible with air and vacuum and cooperable in a manner to produce relative movement of the milker and control valves whereb pulsations are transmitted to teat cups 0 a machine.

and vacuum and cooperable in a manner to' produce relative horizontal sliding movement of the milker andcontrol valves with each other and the valvemember transmitted to teat cups 0 a milking machine.

10. In a milking machine pulsator, a body including a connection to a continuous source of vacuum and a connection to air, a milker valve, a control valve said milker and con trol valve being movable along intersecting axes, a valve member, said valve parts provided with ports connectible with air and vacuum and cooperable in a manner to produce the relative cross movement of the milker and control valves whereby pulsations are transmitted to teat cups of a milking machine.

11; In a milking machine pulsator, a body including a connection to a source of vacuum and alconnection to air, a reciprocatory milker valve, a reciprocatory control valve, a stationary valve member between the two reciprocatory valves,- said valve parts all lying in horizontal planes and being supported in the body and provided with ports connectible with air and vacuum and cooperable in a a manner to produce relative horizontal reciprocatory movement of the milker and control valves whereby pulsations are transmitted to teat cups of a milking machine.

12. In a milking machine pulsator, a body including a connection to acontinuous source of vacuum and a connection to air, a valve 'member having communication with said connections, amilker slide valve reciprocable relative to the said'valve member, said slide valve provided with ports to connect with air and vacuum, a second valve member provided with ports connectible to air and vacuum; and a control slide valve movable,

relative to the second valve member and milker slide valve, said control valve provided with ports arranged so that the control valve moves a "full stroke While the millrer slide valve is held stationary and thereupon at the end of the movement of the control slide valve the milker slide valve moves quickly to produce pulsations to be communicated to teat cups of a milking machine.

l3 In a millnng machine pulsator, a body including a connection to a continuous source of vacuum and a connection to air, a valve member having communication with said connections, a milker valvereciprocable relative to the said valve member, said millror valve provided with ports to connect with air and vacuum, a second valve member provided with ports connectible to air and vacuum, and a controlvalve movable relative to the second valve member and milker valve,

said control valve provided with ports arranged so that the control valve moves a full stroke while the milker valve is held stationary and thereupon at the end of the-movement of the control valve the milker valve moves quickly to produce pulsations to be communicated to teat cups of a milkin machine, said body enclosing all of said va ve mechamenu.

14. In a milking machine pulsator, a body including a connection to a source of vacuum and a connection to air, a valve plate supported in the body and having communication with said connections, a milker slide valve reciprocable on said valve plate, said slide valve provided with ports to connect with air and vacuum, a second valve plate supported in the body and provided with ports conncctible to an and vacuum and a control slide valve supported on the second valve plate, said control valve provided with ports arranged so that the control valve moves a full stroke while the milker slide valve is held stationary and thereupon at the end of the movement of, the control slide the milker slide moves quickly to produce pulsations to be communicated to teat cups of a milking machine.

15. In a milking machine pulsator, a body including a connection to a' source of vacuum and a connection to air, a valve member havin communication with said connections, a nnlker slide valve, a" second valve member, and a control slide valve, all of said valve membersand slide valves having ports therein to cause relative movement of the parts under action of air and vacuum to produce pulsations to be communicated to teat cups of a milking machine.

16. In a milking machine pulsator, a body including a connection to a continuous source of vacuum and a connection to air, a valve member having communication with said con nections, a milker slide valve, said slide valve provided with ports to connect with air and vacuum, asecon'd valve member, and a control'slide valve, all of said slide valves and valve members being inside the body and having ports connectible with air and vacuum so that the control valve moves a full stroke while the milker slide valve is held stationary and thereupon at the end of the movement of the control slide the milker slide moves quickly to produce pulsations to be communicated to teat cups of a milking machine.

17: In a milking machine pulsator, a body including a connection to a continuous source of vacuum and a connection to air, a stationary valve member having communication with said connections, a milker slide valve, said slide valve provided with ports to connect with air and vacuum, a second stationvalve, said control valve provided with ports ary valve member provided with ports connectible to air and vacuum, and a control slide valve movable relative to the milker slide arranged so that the control valve moves a full stroke while the milker slide valve is held stationary and thereupon'at the end of the movement of the control slide the milker four dia slide moves quickly to produce pulsations to be communicated to teat cups of a machine.

18. In a milking machine pulsator, a body having four open sides, means cbnnecting the body to vacuum and. air, "a cap closing each side and enclosing a diaphragm to provide four diaphragm chambers, a pair of relatively movable valve members supported in the body and connected to'said draphragms, said members provided with cooperating ports certain of which communicate with air and vacuum, other ports in the members to lead air or vacuum to the diaphragm chambers, and valve means associated with the valve members to cause movement of said valve members whereby pulsations are transmitted to teatcups of a milking machine.

19. In a milking machine pulsator, a body having four open sides, means connecting the y to vacuum and air, a cap closing each side and enclodng a diaphragm to prov de four dia hragin chambers, a control slide valve and a'mi1ker slide valve supported in the bod and connected to said draphragms, said sli e valves grl'ovided with cooperating ports certain of w 'ch communicate with air and vacuum, other ports in the slide valves to lead air or vacuum to the diaphra 'chambers, and valve means associated with the slide valves whereby pulsations are transmitted to teat cups of a machine.

20. In a milking machine pu ator, a body having four open sides 4 means connecting the body to vacuum an air, a cap closing each side and enclosing a diaphragm to rovide four diaphragm chambers arrange in opposed pairs, a pair of relatively movable recrprocatory valve members an ported in the body and connected at their ends to said diaphragms, said members recip'rocable alon intersecting axes and being provided wit coopera ports certain of which communicate with arr and vacuum, other ports in the members to lead airpr vacuum to the diaphragm chambers, and a'valve plate between the valve members, whereby pulsations are tfansmitted to teat cups of a milking ma-. C 1118.

21. In a milking machine pulsatorya body sides, said body including a base provided with means connecting the body tovacuum and air, a cap closing each side and enclosing a diaphragm to provide hragm c 'ambers, 'a pair of relative ly mova 1e valve memberssupported on the base and connected to said diaphragms, said having four 0 amass provided with cooperating ports certain bf which communicate with air and vacuum, other ports in the members to lead air or vacuumto the diaphragm chambers, and a valve plate carried on the base between the-valvemembers, whereby ulsations are transmitted to teat cups of a m' king machine. 22. "In a milking machine pulsator, a body having four open sides, said body including a base provided with means connectin the y to vacuum and air, posts on said ase, a cap closing each open si e of the body and enclosing a diaphragm to rovide four dia- Ehragm chambers, a pair 0 relativel movale valve members slrdabl supporte on the base and guided by sai posts, said slide members having their ends each connected to a diaphragm, said members provided with cooperating ports certain of which communicate with arr and vacuum, other ports in the members to lead air or vacuum to the diaphragm chambers, and a valve plate mounted on the posts between the slide valve members, wherebypulsations are transmitted to teat cups of a milking machine.

23. In a milking machine pulsator, a body having four open sides, means connecting the body to vacuum and air, a cap closing each side and enclosing a diaphragm to provide four diaphragm chambers, relatively movable milker and control valve members supported in the body for relative sliding movement and connected to said diaphragm, said members provided with cooperating ports certain of which communicate with air and vacuum, other ports in the members to lead air or vacuum to the diaphragm chambers, valve means associated with the valve members to cause pulsations to be transmitted to teat cups of a milking machine, and means for filtering the air used in the ports.

24. In a milking machine pulsator, a body including a connection to a source of vacuum and a connection to air, a milker slide valve, a control slide valve, said valves havin cooperating orts and being movable relatively to each ot e'r, means for regulating porting to vacuum and air whereby the control slide valve'moves a full stroke while the milker valve is idle and then causes the milker to make a quick stroke to transmit pulsations to the teat cups of a milking machine, and an air filter means associated with the control ase open to air 19 FLQYD G. H@ snow, 

